Dapedium is an extinct genus of primitive neopterygian ray-finned fish. The first-described finding was an example of D. politum, found in the Lower Lias of Lyme Regis, on the Jurassic Coast of England (Leach 1822). Dapedium lived in the late Triassic and Jurassic periods. Its body was protected by several, plate-like scales, which made it hard to damage. It's upper jaw was movable and could protrude from its mouth, alowing it to swallow larger prey. It ate hard-shelled invertabrates, like mussels and sea urchins.